6 papers · 2 filters
Role of density imbalance in an interacting bilayer hole system
E. Tutuc, S. Melinte, E. P. De Poortere +2
We study interacting GaAs hole bilayers in the limit of zero tunneling. When the layers have equal densities, we observe a phase coherent bilayer quantum Hall (QH) state at total f…
Magnetic Field Induced Spin Polarization of AlAs Two-dimensional Electrons
E. P. De Poortere, E. Tutuc, Y. P. Shkolnikov +2
Two-dimensional (2D) electrons in an in-plane magnetic field become fully spin polarized above a field B_P, which we can determine from the in-plane magnetoresistance. We perform s…
Spin polarization and transition from metallic to insulating behavior in 2D systems
E. Tutuc, E. P. De Poortere, S. J. Papadakis +1
We have made quantitative measurements of the spin polarization of two-dimensional (2D) GaAs (100) electrons and GaAs (311)A holes, as a function of an in-plane magnetic field. The…
Aharonov-Bohm Oscillations with Spin: Evidence for Berry's Phase
Jeng-Bang Yau, E. P. De Poortere, M. Shayegan
We report a study of the Aharonov-Bohm effect, the oscillations of the resistance of a mesoscopic ring as a function of a perpendicular magnetic field, in a GaAs two-dimensional ho…
Frictional Drag between Two Dilute Two-Dimensional Hole Layers
R. Pillarisetty, Hwayong Noh, D. C. Tsui +3
We report drag measurements on dilute double layer two-dimensional hole systems in the regime of r_s=19~39. We observed a strong enhancement of the drag over the simple Boltzmann c…
Low-field magnetoresistance in GaAs 2D holes
S. J. Papadakis, E. P. De Poortere, H. C. Manoharan +3
We report low-field magnetotransport data in two-dimensional hole systems in GaAs/AlGaAs heterostructures and quantum wells, in a large density range, $2.5 \times 10^{10} \leq p \l…